ip6_input.c revision 1.217
1 /* $NetBSD: ip6_input.c,v 1.217 2020/06/19 16:08:06 maxv Exp $ */ 2 /* $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.217 2020/06/19 16:08:06 maxv Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_gateway.h" 69 #include "opt_inet.h" 70 #include "opt_inet6.h" 71 #include "opt_ipsec.h" 72 #include "opt_net_mpsafe.h" 73 #endif 74 75 #include <sys/param.h> 76 #include <sys/systm.h> 77 #include <sys/mbuf.h> 78 #include <sys/domain.h> 79 #include <sys/protosw.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/errno.h> 83 #include <sys/time.h> 84 #include <sys/kernel.h> 85 #include <sys/syslog.h> 86 #include <sys/proc.h> 87 #include <sys/sysctl.h> 88 #include <sys/cprng.h> 89 #include <sys/percpu.h> 90 91 #include <net/if.h> 92 #include <net/if_types.h> 93 #include <net/if_dl.h> 94 #include <net/route.h> 95 #include <net/pktqueue.h> 96 #include <net/pfil.h> 97 98 #include <netinet/in.h> 99 #include <netinet/in_systm.h> 100 #ifdef INET 101 #include <netinet/ip.h> 102 #include <netinet/ip_var.h> 103 #include <netinet/ip_icmp.h> 104 #endif /* INET */ 105 #include <netinet/ip6.h> 106 #include <netinet/portalgo.h> 107 #include <netinet6/in6_var.h> 108 #include <netinet6/ip6_var.h> 109 #include <netinet6/ip6_private.h> 110 #include <netinet6/in6_pcb.h> 111 #include <netinet/icmp6.h> 112 #include <netinet6/scope6_var.h> 113 #include <netinet6/in6_ifattach.h> 114 #include <netinet6/nd6.h> 115 116 #ifdef IPSEC 117 #include <netipsec/ipsec.h> 118 #include <netipsec/ipsec6.h> 119 #include <netipsec/key.h> 120 #endif /* IPSEC */ 121 122 #include <netinet6/ip6protosw.h> 123 124 #include "faith.h" 125 126 extern struct domain inet6domain; 127 128 u_char ip6_protox[IPPROTO_MAX]; 129 pktqueue_t *ip6_pktq __read_mostly; 130 131 pfil_head_t *inet6_pfil_hook; 132 133 percpu_t *ip6stat_percpu; 134 135 percpu_t *ip6_forward_rt_percpu __cacheline_aligned; 136 137 static void ip6intr(void *); 138 static void ip6_input(struct mbuf *, struct ifnet *); 139 static bool ip6_badaddr(struct ip6_hdr *); 140 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 141 142 static struct m_tag *ip6_addaux(struct mbuf *); 143 static struct m_tag *ip6_findaux(struct mbuf *); 144 static void ip6_delaux(struct mbuf *); 145 146 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *, 147 u_int32_t *); 148 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 149 static void sysctl_net_inet6_ip6_setup(struct sysctllog **); 150 151 #ifdef NET_MPSAFE 152 #define SOFTNET_LOCK() mutex_enter(softnet_lock) 153 #define SOFTNET_UNLOCK() mutex_exit(softnet_lock) 154 #else 155 #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock)) 156 #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock)) 157 #endif 158 159 /* 160 * IP6 initialization: fill in IP6 protocol switch table. 161 * All protocols not implemented in kernel go to raw IP6 protocol handler. 162 */ 163 void 164 ip6_init(void) 165 { 166 const struct ip6protosw *pr; 167 int i; 168 169 in6_init(); 170 171 sysctl_net_inet6_ip6_setup(NULL); 172 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 173 if (pr == 0) 174 panic("ip6_init"); 175 for (i = 0; i < IPPROTO_MAX; i++) 176 ip6_protox[i] = pr - inet6sw; 177 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 178 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 179 if (pr->pr_domain->dom_family == PF_INET6 && 180 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 181 ip6_protox[pr->pr_protocol] = pr - inet6sw; 182 183 ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL); 184 KASSERT(ip6_pktq != NULL); 185 186 scope6_init(); 187 addrsel_policy_init(); 188 nd6_init(); 189 frag6_init(); 190 191 #ifdef GATEWAY 192 ip6flow_init(ip6_hashsize); 193 #endif 194 /* Register our Packet Filter hook. */ 195 inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6); 196 KASSERT(inet6_pfil_hook != NULL); 197 198 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); 199 ip6_forward_rt_percpu = rtcache_percpu_alloc(); 200 } 201 202 /* 203 * IP6 input interrupt handling. Just pass the packet to ip6_input. 204 */ 205 static void 206 ip6intr(void *arg __unused) 207 { 208 struct mbuf *m; 209 210 SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE(); 211 while ((m = pktq_dequeue(ip6_pktq)) != NULL) { 212 struct psref psref; 213 struct ifnet *rcvif = m_get_rcvif_psref(m, &psref); 214 215 if (rcvif == NULL) { 216 m_freem(m); 217 continue; 218 } 219 /* 220 * Drop the packet if IPv6 is disabled on the interface. 221 */ 222 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED)) { 223 m_put_rcvif_psref(rcvif, &psref); 224 m_freem(m); 225 continue; 226 } 227 ip6_input(m, rcvif); 228 m_put_rcvif_psref(rcvif, &psref); 229 } 230 SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 231 } 232 233 static void 234 ip6_input(struct mbuf *m, struct ifnet *rcvif) 235 { 236 struct ip6_hdr *ip6; 237 int hit, off = sizeof(struct ip6_hdr), nest; 238 u_int32_t plen; 239 u_int32_t rtalert = ~0; 240 int nxt, ours = 0, rh_present = 0, frg_present; 241 struct ifnet *deliverifp = NULL; 242 int srcrt = 0; 243 struct rtentry *rt = NULL; 244 union { 245 struct sockaddr dst; 246 struct sockaddr_in6 dst6; 247 } u; 248 struct route *ro; 249 250 KASSERT(rcvif != NULL); 251 252 /* 253 * make sure we don't have onion peering information into m_tag. 254 */ 255 ip6_delaux(m); 256 257 /* 258 * mbuf statistics 259 */ 260 if (m->m_flags & M_EXT) { 261 if (m->m_next) 262 IP6_STATINC(IP6_STAT_MEXT2M); 263 else 264 IP6_STATINC(IP6_STAT_MEXT1); 265 } else { 266 #define M2MMAX 32 267 if (m->m_next) { 268 if (m->m_flags & M_LOOP) 269 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 270 else if (rcvif->if_index < M2MMAX) 271 IP6_STATINC(IP6_STAT_M2M + rcvif->if_index); 272 else 273 IP6_STATINC(IP6_STAT_M2M); 274 } else 275 IP6_STATINC(IP6_STAT_M1); 276 #undef M2MMAX 277 } 278 279 in6_ifstat_inc(rcvif, ifs6_in_receive); 280 IP6_STATINC(IP6_STAT_TOTAL); 281 282 /* 283 * If the IPv6 header is not aligned, slurp it up into a new 284 * mbuf with space for link headers, in the event we forward 285 * it. Otherwise, if it is aligned, make sure the entire base 286 * IPv6 header is in the first mbuf of the chain. 287 */ 288 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 289 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 290 (max_linkhdr + 3) & ~3)) == NULL) { 291 /* XXXJRT new stat, please */ 292 IP6_STATINC(IP6_STAT_TOOSMALL); 293 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 294 return; 295 } 296 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 297 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 298 IP6_STATINC(IP6_STAT_TOOSMALL); 299 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 300 return; 301 } 302 } 303 304 ip6 = mtod(m, struct ip6_hdr *); 305 306 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 307 IP6_STATINC(IP6_STAT_BADVERS); 308 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 309 goto bad; 310 } 311 312 if (ip6_badaddr(ip6)) { 313 IP6_STATINC(IP6_STAT_BADSCOPE); 314 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 315 goto bad; 316 } 317 318 /* 319 * Assume that we can create a fast-forward IP flow entry 320 * based on this packet. 321 */ 322 m->m_flags |= M_CANFASTFWD; 323 324 /* 325 * Run through list of hooks for input packets. If there are any 326 * filters which require that additional packets in the flow are 327 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 328 * Note that filters must _never_ set this flag, as another filter 329 * in the list may have previously cleared it. 330 * 331 * Don't call hooks if the packet has already been processed by 332 * IPsec (encapsulated, tunnel mode). 333 */ 334 #if defined(IPSEC) 335 if (!ipsec_used || !ipsec_skip_pfil(m)) 336 #else 337 if (1) 338 #endif 339 { 340 struct in6_addr odst; 341 int error; 342 343 odst = ip6->ip6_dst; 344 error = pfil_run_hooks(inet6_pfil_hook, &m, rcvif, PFIL_IN); 345 if (error != 0 || m == NULL) { 346 IP6_STATINC(IP6_STAT_PFILDROP_IN); 347 return; 348 } 349 if (m->m_len < sizeof(struct ip6_hdr)) { 350 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 351 IP6_STATINC(IP6_STAT_TOOSMALL); 352 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 353 return; 354 } 355 } 356 ip6 = mtod(m, struct ip6_hdr *); 357 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 358 } 359 360 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 361 362 #ifdef ALTQ 363 if (altq_input != NULL) { 364 SOFTNET_LOCK(); 365 if ((*altq_input)(m, AF_INET6) == 0) { 366 SOFTNET_UNLOCK(); 367 /* packet is dropped by traffic conditioner */ 368 return; 369 } 370 SOFTNET_UNLOCK(); 371 } 372 #endif 373 374 /* 375 * Disambiguate address scope zones (if there is ambiguity). 376 * We first make sure that the original source or destination address 377 * is not in our internal form for scoped addresses. Such addresses 378 * are not necessarily invalid spec-wise, but we cannot accept them due 379 * to the usage conflict. 380 * in6_setscope() then also checks and rejects the cases where src or 381 * dst are the loopback address and the receiving interface 382 * is not loopback. 383 */ 384 if (__predict_false( 385 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 386 goto bad; 387 ip6 = mtod(m, struct ip6_hdr *); 388 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 389 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 390 goto bad; 391 } 392 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 393 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 394 IP6_STATINC(IP6_STAT_BADSCOPE); 395 goto bad; 396 } 397 398 ro = rtcache_percpu_getref(ip6_forward_rt_percpu); 399 400 /* 401 * Multicast check 402 */ 403 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 404 bool ingroup; 405 406 in6_ifstat_inc(rcvif, ifs6_in_mcast); 407 /* 408 * See if we belong to the destination multicast group on the 409 * arrival interface. 410 */ 411 ingroup = in6_multi_group(&ip6->ip6_dst, rcvif); 412 if (ingroup) { 413 ours = 1; 414 } else if (!ip6_mrouter) { 415 uint64_t *ip6s = IP6_STAT_GETREF(); 416 ip6s[IP6_STAT_NOTMEMBER]++; 417 ip6s[IP6_STAT_CANTFORWARD]++; 418 IP6_STAT_PUTREF(); 419 in6_ifstat_inc(rcvif, ifs6_in_discard); 420 goto bad_unref; 421 } 422 deliverifp = rcvif; 423 goto hbhcheck; 424 } 425 426 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 427 428 /* 429 * Unicast check 430 */ 431 rt = rtcache_lookup2(ro, &u.dst, 1, &hit); 432 if (hit) 433 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 434 else 435 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 436 437 /* 438 * Accept the packet if the forwarding interface to the destination 439 * (according to the routing table) is the loopback interface, 440 * unless the associated route has a gateway. 441 * 442 * We don't explicitly match ip6_dst against an interface here. It 443 * is already done in rtcache_lookup2: rt->rt_ifp->if_type will be 444 * IFT_LOOP if the packet is for us. 445 * 446 * Note that this approach causes to accept a packet if there is a 447 * route to the loopback interface for the destination of the packet. 448 * But we think it's even useful in some situations, e.g. when using 449 * a special daemon which wants to intercept the packet. 450 */ 451 if (rt != NULL && 452 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 453 rt->rt_ifp->if_type == IFT_LOOP) { 454 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 455 int addrok; 456 457 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 458 m->m_flags |= M_ANYCAST6; 459 /* 460 * packets to a tentative, duplicated, or somehow invalid 461 * address must not be accepted. 462 */ 463 if (ia6->ia6_flags & IN6_IFF_NOTREADY) 464 addrok = 0; 465 else if (ia6->ia6_flags & IN6_IFF_DETACHED && 466 !IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) 467 { 468 /* Allow internal traffic to DETACHED addresses */ 469 struct sockaddr_in6 sin6; 470 int s; 471 472 memset(&sin6, 0, sizeof(sin6)); 473 sin6.sin6_family = AF_INET6; 474 sin6.sin6_len = sizeof(sin6); 475 sin6.sin6_addr = ip6->ip6_src; 476 s = pserialize_read_enter(); 477 addrok = (ifa_ifwithaddr(sin6tosa(&sin6)) != NULL); 478 pserialize_read_exit(s); 479 } else 480 addrok = 1; 481 if (addrok) { 482 /* this address is ready */ 483 ours = 1; 484 deliverifp = ia6->ia_ifp; /* correct? */ 485 goto hbhcheck; 486 } else { 487 /* address is not ready, so discard the packet. */ 488 char ip6bufs[INET6_ADDRSTRLEN]; 489 char ip6bufd[INET6_ADDRSTRLEN]; 490 nd6log(LOG_INFO, "packet to an unready address %s->%s\n", 491 IN6_PRINT(ip6bufs, &ip6->ip6_src), 492 IN6_PRINT(ip6bufd, &ip6->ip6_dst)); 493 494 goto bad_unref; 495 } 496 } 497 498 /* 499 * FAITH (Firewall Aided Internet Translator) 500 */ 501 #if defined(NFAITH) && 0 < NFAITH 502 if (ip6_keepfaith) { 503 if (rt != NULL && rt->rt_ifp != NULL && 504 rt->rt_ifp->if_type == IFT_FAITH) { 505 /* XXX do we need more sanity checks? */ 506 ours = 1; 507 deliverifp = rt->rt_ifp; /* faith */ 508 goto hbhcheck; 509 } 510 } 511 #endif 512 513 /* 514 * Now there is no reason to process the packet if it's not our own 515 * and we're not a router. 516 */ 517 if (!ip6_forwarding) { 518 IP6_STATINC(IP6_STAT_CANTFORWARD); 519 in6_ifstat_inc(rcvif, ifs6_in_discard); 520 goto bad_unref; 521 } 522 523 hbhcheck: 524 /* 525 * Record address information into m_tag, if we don't have one yet. 526 * Note that we are unable to record it, if the address is not listed 527 * as our interface address (e.g. multicast addresses, addresses 528 * within FAITH prefixes and such). 529 */ 530 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 531 struct in6_ifaddr *ia6; 532 int s = pserialize_read_enter(); 533 534 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 535 /* Depends on ip6_setdstifaddr never sleep */ 536 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 537 /* 538 * XXX maybe we should drop the packet here, 539 * as we could not provide enough information 540 * to the upper layers. 541 */ 542 } 543 pserialize_read_exit(s); 544 } 545 546 /* 547 * Process Hop-by-Hop options header if it's contained. 548 * m may be modified in ip6_hopopts_input(). 549 * If a JumboPayload option is included, plen will also be modified. 550 */ 551 plen = (u_int32_t)ntohs(ip6->ip6_plen); 552 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 553 struct ip6_hbh *hbh; 554 555 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 556 /* m already freed */ 557 in6_ifstat_inc(rcvif, ifs6_in_discard); 558 rtcache_unref(rt, ro); 559 rtcache_percpu_putref(ip6_forward_rt_percpu); 560 return; 561 } 562 563 /* adjust pointer */ 564 ip6 = mtod(m, struct ip6_hdr *); 565 566 /* 567 * if the payload length field is 0 and the next header field 568 * indicates Hop-by-Hop Options header, then a Jumbo Payload 569 * option MUST be included. 570 */ 571 if (ip6->ip6_plen == 0 && plen == 0) { 572 /* 573 * Note that if a valid jumbo payload option is 574 * contained, ip6_hopopts_input() must set a valid 575 * (non-zero) payload length to the variable plen. 576 */ 577 IP6_STATINC(IP6_STAT_BADOPTIONS); 578 in6_ifstat_inc(rcvif, ifs6_in_discard); 579 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 580 icmp6_error(m, ICMP6_PARAM_PROB, 581 ICMP6_PARAMPROB_HEADER, 582 (char *)&ip6->ip6_plen - (char *)ip6); 583 rtcache_unref(rt, ro); 584 rtcache_percpu_putref(ip6_forward_rt_percpu); 585 return; 586 } 587 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 588 sizeof(struct ip6_hbh)); 589 if (hbh == NULL) { 590 IP6_STATINC(IP6_STAT_TOOSHORT); 591 rtcache_unref(rt, ro); 592 rtcache_percpu_putref(ip6_forward_rt_percpu); 593 return; 594 } 595 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 596 nxt = hbh->ip6h_nxt; 597 598 /* 599 * accept the packet if a router alert option is included 600 * and we act as an IPv6 router. 601 */ 602 if (rtalert != ~0 && ip6_forwarding) 603 ours = 1; 604 } else 605 nxt = ip6->ip6_nxt; 606 607 /* 608 * Check that the amount of data in the buffers is at least much as 609 * the IPv6 header would have us expect. Trim mbufs if longer than we 610 * expect. Drop packet if shorter than we expect. 611 */ 612 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 613 IP6_STATINC(IP6_STAT_TOOSHORT); 614 in6_ifstat_inc(rcvif, ifs6_in_truncated); 615 goto bad_unref; 616 } 617 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 618 if (m->m_len == m->m_pkthdr.len) { 619 m->m_len = sizeof(struct ip6_hdr) + plen; 620 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 621 } else 622 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 623 } 624 625 /* 626 * Forward if desirable. 627 */ 628 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 629 /* 630 * If we are acting as a multicast router, all 631 * incoming multicast packets are passed to the 632 * kernel-level multicast forwarding function. 633 * The packet is returned (relatively) intact; if 634 * ip6_mforward() returns a non-zero value, the packet 635 * must be discarded, else it may be accepted below. 636 */ 637 if (ip6_mrouter != NULL) { 638 int error; 639 640 SOFTNET_LOCK(); 641 error = ip6_mforward(ip6, rcvif, m); 642 SOFTNET_UNLOCK(); 643 644 if (error != 0) { 645 rtcache_unref(rt, ro); 646 rtcache_percpu_putref(ip6_forward_rt_percpu); 647 IP6_STATINC(IP6_STAT_CANTFORWARD); 648 goto bad; 649 } 650 } 651 if (!ours) 652 goto bad_unref; 653 } else if (!ours) { 654 rtcache_unref(rt, ro); 655 rtcache_percpu_putref(ip6_forward_rt_percpu); 656 ip6_forward(m, srcrt); 657 return; 658 } 659 660 ip6 = mtod(m, struct ip6_hdr *); 661 662 /* 663 * Malicious party may be able to use IPv4 mapped addr to confuse 664 * tcp/udp stack and bypass security checks (act as if it was from 665 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 666 * 667 * For SIIT end node behavior, you may want to disable the check. 668 * However, you will become vulnerable to attacks using IPv4 mapped 669 * source. 670 */ 671 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 672 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 673 IP6_STATINC(IP6_STAT_BADSCOPE); 674 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 675 goto bad_unref; 676 } 677 678 #ifdef IFA_STATS 679 if (deliverifp != NULL) { 680 struct in6_ifaddr *ia6; 681 int s = pserialize_read_enter(); 682 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 683 if (ia6) 684 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 685 pserialize_read_exit(s); 686 } 687 #endif 688 IP6_STATINC(IP6_STAT_DELIVERED); 689 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 690 nest = 0; 691 692 if (rt != NULL) { 693 rtcache_unref(rt, ro); 694 rt = NULL; 695 } 696 rtcache_percpu_putref(ip6_forward_rt_percpu); 697 698 rh_present = 0; 699 frg_present = 0; 700 while (nxt != IPPROTO_DONE) { 701 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 702 IP6_STATINC(IP6_STAT_TOOMANYHDR); 703 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 704 goto bad; 705 } 706 707 M_VERIFY_PACKET(m); 708 709 /* 710 * protection against faulty packet - there should be 711 * more sanity checks in header chain processing. 712 */ 713 if (m->m_pkthdr.len < off) { 714 IP6_STATINC(IP6_STAT_TOOSHORT); 715 in6_ifstat_inc(rcvif, ifs6_in_truncated); 716 goto bad; 717 } 718 719 if (nxt == IPPROTO_ROUTING) { 720 if (rh_present++) { 721 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 722 IP6_STATINC(IP6_STAT_BADOPTIONS); 723 goto bad; 724 } 725 } else if (nxt == IPPROTO_FRAGMENT) { 726 if (frg_present++) { 727 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 728 IP6_STATINC(IP6_STAT_BADOPTIONS); 729 goto bad; 730 } 731 } 732 733 #ifdef IPSEC 734 if (ipsec_used) { 735 /* 736 * Enforce IPsec policy checking if we are seeing last 737 * header. Note that we do not visit this with 738 * protocols with pcb layer code - like udp/tcp/raw ip. 739 */ 740 if ((inet6sw[ip6_protox[nxt]].pr_flags 741 & PR_LASTHDR) != 0) { 742 int error; 743 744 error = ipsec_ip_input(m, false); 745 if (error) 746 goto bad; 747 } 748 } 749 #endif 750 751 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 752 } 753 return; 754 755 bad_unref: 756 rtcache_unref(rt, ro); 757 rtcache_percpu_putref(ip6_forward_rt_percpu); 758 bad: 759 m_freem(m); 760 return; 761 } 762 763 static bool 764 ip6_badaddr(struct ip6_hdr *ip6) 765 { 766 /* Check against address spoofing/corruption. */ 767 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 768 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 769 return true; 770 } 771 772 /* 773 * The following check is not documented in specs. A malicious 774 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 775 * and bypass security checks (act as if it was from 127.0.0.1 by using 776 * IPv6 src ::ffff:127.0.0.1). Be cautious. 777 * 778 * This check chokes if we are in an SIIT cloud. As none of BSDs 779 * support IPv4-less kernel compilation, we cannot support SIIT 780 * environment at all. So, it makes more sense for us to reject any 781 * malicious packets for non-SIIT environment, than try to do a 782 * partial support for SIIT environment. 783 */ 784 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 785 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 786 return true; 787 } 788 789 /* 790 * Reject packets with IPv4-compatible IPv6 addresses (RFC4291). 791 */ 792 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 793 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 794 return true; 795 } 796 797 return false; 798 } 799 800 /* 801 * set/grab in6_ifaddr correspond to IPv6 destination address. 802 */ 803 static struct m_tag * 804 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 805 { 806 struct m_tag *mtag; 807 struct ip6aux *ip6a; 808 809 mtag = ip6_addaux(m); 810 if (mtag == NULL) 811 return NULL; 812 813 ip6a = (struct ip6aux *)(mtag + 1); 814 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 815 IP6_STATINC(IP6_STAT_BADSCOPE); 816 return NULL; 817 } 818 819 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 820 ip6a->ip6a_flags = ia->ia6_flags; 821 return mtag; 822 } 823 824 const struct ip6aux * 825 ip6_getdstifaddr(struct mbuf *m) 826 { 827 struct m_tag *mtag; 828 829 mtag = ip6_findaux(m); 830 if (mtag != NULL) 831 return (struct ip6aux *)(mtag + 1); 832 else 833 return NULL; 834 } 835 836 /* 837 * Hop-by-Hop options header processing. If a valid jumbo payload option is 838 * included, the real payload length will be stored in plenp. 839 * 840 * rtalertp - XXX: should be stored more smart way 841 */ 842 int 843 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 844 struct mbuf **mp, int *offp) 845 { 846 struct mbuf *m = *mp; 847 int off = *offp, hbhlen; 848 struct ip6_hbh *hbh; 849 850 /* validation of the length of the header */ 851 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 852 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 853 if (hbh == NULL) { 854 IP6_STATINC(IP6_STAT_TOOSHORT); 855 return -1; 856 } 857 hbhlen = (hbh->ip6h_len + 1) << 3; 858 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 859 hbhlen); 860 if (hbh == NULL) { 861 IP6_STATINC(IP6_STAT_TOOSHORT); 862 return -1; 863 } 864 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 865 off += hbhlen; 866 hbhlen -= sizeof(struct ip6_hbh); 867 868 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 869 hbhlen, rtalertp, plenp) < 0) 870 return -1; 871 872 *offp = off; 873 *mp = m; 874 return 0; 875 } 876 877 /* 878 * Search header for all Hop-by-hop options and process each option. 879 * This function is separate from ip6_hopopts_input() in order to 880 * handle a case where the sending node itself process its hop-by-hop 881 * options header. In such a case, the function is called from ip6_output(). 882 * 883 * The function assumes that hbh header is located right after the IPv6 header 884 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 885 * opthead + hbhlen is located in continuous memory region. 886 */ 887 static int 888 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 889 u_int32_t *rtalertp, u_int32_t *plenp) 890 { 891 struct ip6_hdr *ip6; 892 int optlen = 0; 893 u_int8_t *opt = opthead; 894 u_int16_t rtalert_val; 895 u_int32_t jumboplen; 896 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 897 898 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 899 switch (*opt) { 900 case IP6OPT_PAD1: 901 optlen = 1; 902 break; 903 case IP6OPT_PADN: 904 if (hbhlen < IP6OPT_MINLEN) { 905 IP6_STATINC(IP6_STAT_TOOSMALL); 906 goto bad; 907 } 908 optlen = *(opt + 1) + 2; 909 break; 910 case IP6OPT_RTALERT: 911 /* XXX may need check for alignment */ 912 if (hbhlen < IP6OPT_RTALERT_LEN) { 913 IP6_STATINC(IP6_STAT_TOOSMALL); 914 goto bad; 915 } 916 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 917 /* XXX stat */ 918 icmp6_error(m, ICMP6_PARAM_PROB, 919 ICMP6_PARAMPROB_HEADER, 920 erroff + opt + 1 - opthead); 921 return (-1); 922 } 923 optlen = IP6OPT_RTALERT_LEN; 924 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 925 *rtalertp = ntohs(rtalert_val); 926 break; 927 case IP6OPT_JUMBO: 928 /* XXX may need check for alignment */ 929 if (hbhlen < IP6OPT_JUMBO_LEN) { 930 IP6_STATINC(IP6_STAT_TOOSMALL); 931 goto bad; 932 } 933 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 934 /* XXX stat */ 935 icmp6_error(m, ICMP6_PARAM_PROB, 936 ICMP6_PARAMPROB_HEADER, 937 erroff + opt + 1 - opthead); 938 return (-1); 939 } 940 optlen = IP6OPT_JUMBO_LEN; 941 942 /* 943 * IPv6 packets that have non 0 payload length 944 * must not contain a jumbo payload option. 945 */ 946 ip6 = mtod(m, struct ip6_hdr *); 947 if (ip6->ip6_plen) { 948 IP6_STATINC(IP6_STAT_BADOPTIONS); 949 icmp6_error(m, ICMP6_PARAM_PROB, 950 ICMP6_PARAMPROB_HEADER, 951 erroff + opt - opthead); 952 return (-1); 953 } 954 955 /* 956 * We may see jumbolen in unaligned location, so 957 * we'd need to perform memcpy(). 958 */ 959 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 960 jumboplen = (u_int32_t)htonl(jumboplen); 961 962 #if 1 963 /* 964 * if there are multiple jumbo payload options, 965 * *plenp will be non-zero and the packet will be 966 * rejected. 967 * the behavior may need some debate in ipngwg - 968 * multiple options does not make sense, however, 969 * there's no explicit mention in specification. 970 */ 971 if (*plenp != 0) { 972 IP6_STATINC(IP6_STAT_BADOPTIONS); 973 icmp6_error(m, ICMP6_PARAM_PROB, 974 ICMP6_PARAMPROB_HEADER, 975 erroff + opt + 2 - opthead); 976 return (-1); 977 } 978 #endif 979 980 /* 981 * jumbo payload length must be larger than 65535. 982 */ 983 if (jumboplen <= IPV6_MAXPACKET) { 984 IP6_STATINC(IP6_STAT_BADOPTIONS); 985 icmp6_error(m, ICMP6_PARAM_PROB, 986 ICMP6_PARAMPROB_HEADER, 987 erroff + opt + 2 - opthead); 988 return (-1); 989 } 990 *plenp = jumboplen; 991 992 break; 993 default: /* unknown option */ 994 if (hbhlen < IP6OPT_MINLEN) { 995 IP6_STATINC(IP6_STAT_TOOSMALL); 996 goto bad; 997 } 998 optlen = ip6_unknown_opt(opt, m, 999 erroff + opt - opthead); 1000 if (optlen == -1) 1001 return (-1); 1002 optlen += 2; 1003 break; 1004 } 1005 } 1006 1007 return (0); 1008 1009 bad: 1010 m_freem(m); 1011 return (-1); 1012 } 1013 1014 /* 1015 * Unknown option processing. 1016 * The third argument `off' is the offset from the IPv6 header to the option, 1017 * which is necessary if the IPv6 header the and option header and IPv6 header 1018 * is not continuous in order to return an ICMPv6 error. 1019 */ 1020 int 1021 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1022 { 1023 struct ip6_hdr *ip6; 1024 1025 switch (IP6OPT_TYPE(*optp)) { 1026 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1027 return ((int)*(optp + 1)); 1028 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1029 m_freem(m); 1030 return (-1); 1031 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1032 IP6_STATINC(IP6_STAT_BADOPTIONS); 1033 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1034 return (-1); 1035 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1036 IP6_STATINC(IP6_STAT_BADOPTIONS); 1037 ip6 = mtod(m, struct ip6_hdr *); 1038 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1039 (m->m_flags & (M_BCAST|M_MCAST))) 1040 m_freem(m); 1041 else 1042 icmp6_error(m, ICMP6_PARAM_PROB, 1043 ICMP6_PARAMPROB_OPTION, off); 1044 return (-1); 1045 } 1046 1047 m_freem(m); /* XXX: NOTREACHED */ 1048 return (-1); 1049 } 1050 1051 void 1052 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1053 struct ip6_hdr *ip6, struct mbuf *m) 1054 { 1055 struct socket *so = in6p->in6p_socket; 1056 #ifdef RFC2292 1057 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1058 #else 1059 #define IS2292(x, y) (y) 1060 #endif 1061 1062 KASSERT(m->m_flags & M_PKTHDR); 1063 1064 if (SOOPT_TIMESTAMP(so->so_options)) 1065 mp = sbsavetimestamp(so->so_options, mp); 1066 1067 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1068 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1069 return; 1070 1071 /* RFC 2292 sec. 5 */ 1072 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1073 struct in6_pktinfo pi6; 1074 1075 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1076 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1077 pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index; 1078 *mp = sbcreatecontrol(&pi6, sizeof(pi6), 1079 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1080 if (*mp) 1081 mp = &(*mp)->m_next; 1082 } 1083 1084 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1085 int hlim = ip6->ip6_hlim & 0xff; 1086 1087 *mp = sbcreatecontrol(&hlim, sizeof(hlim), 1088 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1089 if (*mp) 1090 mp = &(*mp)->m_next; 1091 } 1092 1093 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1094 u_int32_t flowinfo; 1095 int tclass; 1096 1097 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1098 flowinfo >>= 20; 1099 1100 tclass = flowinfo & 0xff; 1101 *mp = sbcreatecontrol(&tclass, sizeof(tclass), 1102 IPV6_TCLASS, IPPROTO_IPV6); 1103 1104 if (*mp) 1105 mp = &(*mp)->m_next; 1106 } 1107 1108 /* 1109 * IPV6_HOPOPTS socket option. Recall that we required super-user 1110 * privilege for the option (see ip6_ctloutput), but it might be too 1111 * strict, since there might be some hop-by-hop options which can be 1112 * returned to normal user. 1113 * See also RFC3542 section 8 (or RFC2292 section 6). 1114 */ 1115 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1116 /* 1117 * Check if a hop-by-hop options header is contatined in the 1118 * received packet, and if so, store the options as ancillary 1119 * data. Note that a hop-by-hop options header must be 1120 * just after the IPv6 header, which fact is assured through 1121 * the IPv6 input processing. 1122 */ 1123 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1124 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1125 struct ip6_hbh *hbh; 1126 int hbhlen; 1127 struct mbuf *ext; 1128 1129 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1130 xip6->ip6_nxt); 1131 if (ext == NULL) { 1132 IP6_STATINC(IP6_STAT_TOOSHORT); 1133 return; 1134 } 1135 hbh = mtod(ext, struct ip6_hbh *); 1136 hbhlen = (hbh->ip6h_len + 1) << 3; 1137 if (hbhlen != ext->m_len) { 1138 m_freem(ext); 1139 IP6_STATINC(IP6_STAT_TOOSHORT); 1140 return; 1141 } 1142 1143 /* 1144 * XXX: We copy whole the header even if a jumbo 1145 * payload option is included, which option is to 1146 * be removed before returning in the RFC 2292. 1147 * Note: this constraint is removed in RFC3542. 1148 */ 1149 *mp = sbcreatecontrol(hbh, hbhlen, 1150 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1151 IPPROTO_IPV6); 1152 if (*mp) 1153 mp = &(*mp)->m_next; 1154 m_freem(ext); 1155 } 1156 } 1157 1158 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1159 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1160 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1161 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1162 1163 /* 1164 * Search for destination options headers or routing 1165 * header(s) through the header chain, and stores each 1166 * header as ancillary data. 1167 * Note that the order of the headers remains in 1168 * the chain of ancillary data. 1169 */ 1170 for (;;) { /* is explicit loop prevention necessary? */ 1171 struct ip6_ext *ip6e = NULL; 1172 int elen; 1173 struct mbuf *ext = NULL; 1174 1175 /* 1176 * if it is not an extension header, don't try to 1177 * pull it from the chain. 1178 */ 1179 switch (nxt) { 1180 case IPPROTO_DSTOPTS: 1181 case IPPROTO_ROUTING: 1182 case IPPROTO_HOPOPTS: 1183 case IPPROTO_AH: /* is it possible? */ 1184 break; 1185 default: 1186 goto loopend; 1187 } 1188 1189 ext = ip6_pullexthdr(m, off, nxt); 1190 if (ext == NULL) { 1191 IP6_STATINC(IP6_STAT_TOOSHORT); 1192 return; 1193 } 1194 ip6e = mtod(ext, struct ip6_ext *); 1195 if (nxt == IPPROTO_AH) 1196 elen = (ip6e->ip6e_len + 2) << 2; 1197 else 1198 elen = (ip6e->ip6e_len + 1) << 3; 1199 if (elen != ext->m_len) { 1200 m_freem(ext); 1201 IP6_STATINC(IP6_STAT_TOOSHORT); 1202 return; 1203 } 1204 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1205 1206 switch (nxt) { 1207 case IPPROTO_DSTOPTS: 1208 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1209 break; 1210 1211 *mp = sbcreatecontrol(ip6e, elen, 1212 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1213 IPPROTO_IPV6); 1214 if (*mp) 1215 mp = &(*mp)->m_next; 1216 break; 1217 1218 case IPPROTO_ROUTING: 1219 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1220 break; 1221 1222 *mp = sbcreatecontrol(ip6e, elen, 1223 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1224 IPPROTO_IPV6); 1225 if (*mp) 1226 mp = &(*mp)->m_next; 1227 break; 1228 1229 case IPPROTO_HOPOPTS: 1230 case IPPROTO_AH: /* is it possible? */ 1231 break; 1232 1233 default: 1234 /* 1235 * other cases have been filtered in the above. 1236 * none will visit this case. here we supply 1237 * the code just in case (nxt overwritten or 1238 * other cases). 1239 */ 1240 m_freem(ext); 1241 goto loopend; 1242 1243 } 1244 1245 /* proceed with the next header. */ 1246 off += elen; 1247 nxt = ip6e->ip6e_nxt; 1248 ip6e = NULL; 1249 m_freem(ext); 1250 ext = NULL; 1251 } 1252 loopend: 1253 ; 1254 } 1255 } 1256 #undef IS2292 1257 1258 1259 void 1260 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1261 uint32_t *mtu) 1262 { 1263 struct socket *so; 1264 struct mbuf *m_mtu; 1265 struct ip6_mtuinfo mtuctl; 1266 1267 so = in6p->in6p_socket; 1268 1269 if (mtu == NULL) 1270 return; 1271 1272 KASSERT(so != NULL); 1273 1274 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1275 mtuctl.ip6m_mtu = *mtu; 1276 mtuctl.ip6m_addr = *dst; 1277 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1278 return; 1279 1280 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl), 1281 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1282 return; 1283 1284 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1285 == 0) { 1286 soroverflow(so); 1287 m_freem(m_mtu); 1288 } else 1289 sorwakeup(so); 1290 1291 return; 1292 } 1293 1294 /* 1295 * pull single extension header from mbuf chain. returns single mbuf that 1296 * contains the result, or NULL on error. 1297 */ 1298 static struct mbuf * 1299 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1300 { 1301 struct ip6_ext ip6e; 1302 size_t elen; 1303 struct mbuf *n; 1304 1305 if (off + sizeof(ip6e) > m->m_pkthdr.len) 1306 return NULL; 1307 1308 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1309 if (nxt == IPPROTO_AH) 1310 elen = (ip6e.ip6e_len + 2) << 2; 1311 else 1312 elen = (ip6e.ip6e_len + 1) << 3; 1313 1314 if (off + elen > m->m_pkthdr.len) 1315 return NULL; 1316 1317 MGET(n, M_DONTWAIT, MT_DATA); 1318 if (n && elen >= MLEN) { 1319 MCLGET(n, M_DONTWAIT); 1320 if ((n->m_flags & M_EXT) == 0) { 1321 m_free(n); 1322 n = NULL; 1323 } 1324 } 1325 if (!n) 1326 return NULL; 1327 1328 n->m_len = 0; 1329 if (elen >= M_TRAILINGSPACE(n)) { 1330 m_free(n); 1331 return NULL; 1332 } 1333 1334 m_copydata(m, off, elen, mtod(n, void *)); 1335 n->m_len = elen; 1336 return n; 1337 } 1338 1339 /* 1340 * Get offset to the previous header followed by the header 1341 * currently processed. 1342 */ 1343 int 1344 ip6_get_prevhdr(struct mbuf *m, int off) 1345 { 1346 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1347 1348 if (off == sizeof(struct ip6_hdr)) { 1349 return offsetof(struct ip6_hdr, ip6_nxt); 1350 } else if (off < sizeof(struct ip6_hdr)) { 1351 panic("%s: off < sizeof(struct ip6_hdr)", __func__); 1352 } else { 1353 int len, nlen, nxt; 1354 struct ip6_ext ip6e; 1355 1356 nxt = ip6->ip6_nxt; 1357 len = sizeof(struct ip6_hdr); 1358 nlen = 0; 1359 while (len < off) { 1360 m_copydata(m, len, sizeof(ip6e), &ip6e); 1361 1362 switch (nxt) { 1363 case IPPROTO_FRAGMENT: 1364 nlen = sizeof(struct ip6_frag); 1365 break; 1366 case IPPROTO_AH: 1367 nlen = (ip6e.ip6e_len + 2) << 2; 1368 break; 1369 default: 1370 nlen = (ip6e.ip6e_len + 1) << 3; 1371 break; 1372 } 1373 len += nlen; 1374 nxt = ip6e.ip6e_nxt; 1375 } 1376 1377 return (len - nlen); 1378 } 1379 } 1380 1381 /* 1382 * get next header offset. m will be retained. 1383 */ 1384 int 1385 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1386 { 1387 struct ip6_hdr ip6; 1388 struct ip6_ext ip6e; 1389 struct ip6_frag fh; 1390 1391 /* just in case */ 1392 if (m == NULL) 1393 panic("%s: m == NULL", __func__); 1394 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1395 return -1; 1396 1397 switch (proto) { 1398 case IPPROTO_IPV6: 1399 /* do not chase beyond intermediate IPv6 headers */ 1400 if (off != 0) 1401 return -1; 1402 if (m->m_pkthdr.len < off + sizeof(ip6)) 1403 return -1; 1404 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1405 if (nxtp) 1406 *nxtp = ip6.ip6_nxt; 1407 off += sizeof(ip6); 1408 return off; 1409 1410 case IPPROTO_FRAGMENT: 1411 /* 1412 * terminate parsing if it is not the first fragment, 1413 * it does not make sense to parse through it. 1414 */ 1415 if (m->m_pkthdr.len < off + sizeof(fh)) 1416 return -1; 1417 m_copydata(m, off, sizeof(fh), (void *)&fh); 1418 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1419 return -1; 1420 if (nxtp) 1421 *nxtp = fh.ip6f_nxt; 1422 off += sizeof(struct ip6_frag); 1423 return off; 1424 1425 case IPPROTO_AH: 1426 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1427 return -1; 1428 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1429 if (nxtp) 1430 *nxtp = ip6e.ip6e_nxt; 1431 off += (ip6e.ip6e_len + 2) << 2; 1432 if (m->m_pkthdr.len < off) 1433 return -1; 1434 return off; 1435 1436 case IPPROTO_HOPOPTS: 1437 case IPPROTO_ROUTING: 1438 case IPPROTO_DSTOPTS: 1439 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1440 return -1; 1441 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1442 if (nxtp) 1443 *nxtp = ip6e.ip6e_nxt; 1444 off += (ip6e.ip6e_len + 1) << 3; 1445 if (m->m_pkthdr.len < off) 1446 return -1; 1447 return off; 1448 1449 case IPPROTO_NONE: 1450 case IPPROTO_ESP: 1451 case IPPROTO_IPCOMP: 1452 /* give up */ 1453 return -1; 1454 1455 default: 1456 return -1; 1457 } 1458 } 1459 1460 /* 1461 * get offset for the last header in the chain. m will be kept untainted. 1462 */ 1463 int 1464 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1465 { 1466 int newoff; 1467 int nxt; 1468 1469 if (!nxtp) { 1470 nxt = -1; 1471 nxtp = &nxt; 1472 } 1473 for (;;) { 1474 newoff = ip6_nexthdr(m, off, proto, nxtp); 1475 if (newoff < 0) 1476 return off; 1477 else if (newoff < off) 1478 return -1; /* invalid */ 1479 else if (newoff == off) 1480 return newoff; 1481 1482 off = newoff; 1483 proto = *nxtp; 1484 } 1485 } 1486 1487 static struct m_tag * 1488 ip6_addaux(struct mbuf *m) 1489 { 1490 struct m_tag *mtag; 1491 1492 mtag = m_tag_find(m, PACKET_TAG_INET6); 1493 if (!mtag) { 1494 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1495 M_NOWAIT); 1496 if (mtag) { 1497 m_tag_prepend(m, mtag); 1498 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1499 } 1500 } 1501 return mtag; 1502 } 1503 1504 static struct m_tag * 1505 ip6_findaux(struct mbuf *m) 1506 { 1507 struct m_tag *mtag; 1508 1509 mtag = m_tag_find(m, PACKET_TAG_INET6); 1510 return mtag; 1511 } 1512 1513 static void 1514 ip6_delaux(struct mbuf *m) 1515 { 1516 struct m_tag *mtag; 1517 1518 mtag = m_tag_find(m, PACKET_TAG_INET6); 1519 if (mtag) 1520 m_tag_delete(m, mtag); 1521 } 1522 1523 /* 1524 * System control for IP6 1525 */ 1526 1527 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1528 0, 0, 0, 0, 1529 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1530 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1531 EMSGSIZE, EHOSTUNREACH, 0, 0, 1532 0, 0, 0, 0, 1533 ENOPROTOOPT 1534 }; 1535 1536 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS); 1537 1538 static int 1539 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1540 { 1541 1542 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1543 } 1544 1545 static void 1546 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1547 { 1548 1549 sysctl_createv(clog, 0, NULL, NULL, 1550 CTLFLAG_PERMANENT, 1551 CTLTYPE_NODE, "inet6", 1552 SYSCTL_DESCR("PF_INET6 related settings"), 1553 NULL, 0, NULL, 0, 1554 CTL_NET, PF_INET6, CTL_EOL); 1555 sysctl_createv(clog, 0, NULL, NULL, 1556 CTLFLAG_PERMANENT, 1557 CTLTYPE_NODE, "ip6", 1558 SYSCTL_DESCR("IPv6 related settings"), 1559 NULL, 0, NULL, 0, 1560 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1561 1562 sysctl_createv(clog, 0, NULL, NULL, 1563 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1564 CTLTYPE_INT, "forwarding", 1565 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1566 NULL, 0, &ip6_forwarding, 0, 1567 CTL_NET, PF_INET6, IPPROTO_IPV6, 1568 IPV6CTL_FORWARDING, CTL_EOL); 1569 sysctl_createv(clog, 0, NULL, NULL, 1570 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1571 CTLTYPE_INT, "redirect", 1572 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1573 NULL, 0, &ip6_sendredirects, 0, 1574 CTL_NET, PF_INET6, IPPROTO_IPV6, 1575 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1576 sysctl_createv(clog, 0, NULL, NULL, 1577 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1578 CTLTYPE_INT, "hlim", 1579 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1580 NULL, 0, &ip6_defhlim, 0, 1581 CTL_NET, PF_INET6, IPPROTO_IPV6, 1582 IPV6CTL_DEFHLIM, CTL_EOL); 1583 sysctl_createv(clog, 0, NULL, NULL, 1584 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1585 CTLTYPE_INT, "maxfragpackets", 1586 SYSCTL_DESCR("Maximum number of fragments to buffer " 1587 "for reassembly"), 1588 NULL, 0, &ip6_maxfragpackets, 0, 1589 CTL_NET, PF_INET6, IPPROTO_IPV6, 1590 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1591 sysctl_createv(clog, 0, NULL, NULL, 1592 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1593 CTLTYPE_INT, "keepfaith", 1594 SYSCTL_DESCR("Activate faith interface"), 1595 NULL, 0, &ip6_keepfaith, 0, 1596 CTL_NET, PF_INET6, IPPROTO_IPV6, 1597 IPV6CTL_KEEPFAITH, CTL_EOL); 1598 sysctl_createv(clog, 0, NULL, NULL, 1599 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1600 CTLTYPE_INT, "log_interval", 1601 SYSCTL_DESCR("Minimum interval between logging " 1602 "unroutable packets"), 1603 NULL, 0, &ip6_log_interval, 0, 1604 CTL_NET, PF_INET6, IPPROTO_IPV6, 1605 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1606 sysctl_createv(clog, 0, NULL, NULL, 1607 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1608 CTLTYPE_INT, "hdrnestlimit", 1609 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1610 NULL, 0, &ip6_hdrnestlimit, 0, 1611 CTL_NET, PF_INET6, IPPROTO_IPV6, 1612 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1613 sysctl_createv(clog, 0, NULL, NULL, 1614 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1615 CTLTYPE_INT, "dad_count", 1616 SYSCTL_DESCR("Number of Duplicate Address Detection " 1617 "probes to send"), 1618 NULL, 0, &ip6_dad_count, 0, 1619 CTL_NET, PF_INET6, IPPROTO_IPV6, 1620 IPV6CTL_DAD_COUNT, CTL_EOL); 1621 sysctl_createv(clog, 0, NULL, NULL, 1622 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1623 CTLTYPE_INT, "auto_flowlabel", 1624 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1625 NULL, 0, &ip6_auto_flowlabel, 0, 1626 CTL_NET, PF_INET6, IPPROTO_IPV6, 1627 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1628 sysctl_createv(clog, 0, NULL, NULL, 1629 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1630 CTLTYPE_INT, "defmcasthlim", 1631 SYSCTL_DESCR("Default multicast hop limit"), 1632 NULL, 0, &ip6_defmcasthlim, 0, 1633 CTL_NET, PF_INET6, IPPROTO_IPV6, 1634 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1635 sysctl_createv(clog, 0, NULL, NULL, 1636 CTLFLAG_PERMANENT, 1637 CTLTYPE_STRING, "kame_version", 1638 SYSCTL_DESCR("KAME Version"), 1639 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1640 CTL_NET, PF_INET6, IPPROTO_IPV6, 1641 IPV6CTL_KAME_VERSION, CTL_EOL); 1642 sysctl_createv(clog, 0, NULL, NULL, 1643 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1644 CTLTYPE_INT, "use_deprecated", 1645 SYSCTL_DESCR("Allow use of deprecated addresses as " 1646 "source addresses"), 1647 NULL, 0, &ip6_use_deprecated, 0, 1648 CTL_NET, PF_INET6, IPPROTO_IPV6, 1649 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1650 sysctl_createv(clog, 0, NULL, NULL, 1651 CTLFLAG_PERMANENT 1652 #ifndef INET6_BINDV6ONLY 1653 |CTLFLAG_READWRITE, 1654 #endif 1655 CTLTYPE_INT, "v6only", 1656 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1657 "to PF_INET sockets"), 1658 NULL, 0, &ip6_v6only, 0, 1659 CTL_NET, PF_INET6, IPPROTO_IPV6, 1660 IPV6CTL_V6ONLY, CTL_EOL); 1661 sysctl_createv(clog, 0, NULL, NULL, 1662 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1663 CTLTYPE_INT, "anonportmin", 1664 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1665 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1666 CTL_NET, PF_INET6, IPPROTO_IPV6, 1667 IPV6CTL_ANONPORTMIN, CTL_EOL); 1668 sysctl_createv(clog, 0, NULL, NULL, 1669 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1670 CTLTYPE_INT, "anonportmax", 1671 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1672 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1673 CTL_NET, PF_INET6, IPPROTO_IPV6, 1674 IPV6CTL_ANONPORTMAX, CTL_EOL); 1675 #ifndef IPNOPRIVPORTS 1676 sysctl_createv(clog, 0, NULL, NULL, 1677 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1678 CTLTYPE_INT, "lowportmin", 1679 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1680 "to assign"), 1681 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1682 CTL_NET, PF_INET6, IPPROTO_IPV6, 1683 IPV6CTL_LOWPORTMIN, CTL_EOL); 1684 sysctl_createv(clog, 0, NULL, NULL, 1685 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1686 CTLTYPE_INT, "lowportmax", 1687 SYSCTL_DESCR("Highest privileged ephemeral port number " 1688 "to assign"), 1689 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1690 CTL_NET, PF_INET6, IPPROTO_IPV6, 1691 IPV6CTL_LOWPORTMAX, CTL_EOL); 1692 #endif /* IPNOPRIVPORTS */ 1693 sysctl_createv(clog, 0, NULL, NULL, 1694 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1695 CTLTYPE_INT, "auto_linklocal", 1696 SYSCTL_DESCR("Default value of per-interface flag for " 1697 "adding an IPv6 link-local address to " 1698 "interfaces when attached"), 1699 NULL, 0, &ip6_auto_linklocal, 0, 1700 CTL_NET, PF_INET6, IPPROTO_IPV6, 1701 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1702 sysctl_createv(clog, 0, NULL, NULL, 1703 CTLFLAG_PERMANENT|CTLFLAG_READONLY, 1704 CTLTYPE_STRUCT, "addctlpolicy", 1705 SYSCTL_DESCR("Return the current address control" 1706 " policy"), 1707 sysctl_net_inet6_addrctlpolicy, 0, NULL, 0, 1708 CTL_NET, PF_INET6, IPPROTO_IPV6, 1709 IPV6CTL_ADDRCTLPOLICY, CTL_EOL); 1710 sysctl_createv(clog, 0, NULL, NULL, 1711 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1712 CTLTYPE_INT, "prefer_tempaddr", 1713 SYSCTL_DESCR("Prefer temporary address as source " 1714 "address"), 1715 NULL, 0, &ip6_prefer_tempaddr, 0, 1716 CTL_NET, PF_INET6, IPPROTO_IPV6, 1717 CTL_CREATE, CTL_EOL); 1718 sysctl_createv(clog, 0, NULL, NULL, 1719 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1720 CTLTYPE_INT, "maxfrags", 1721 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1722 NULL, 0, &ip6_maxfrags, 0, 1723 CTL_NET, PF_INET6, IPPROTO_IPV6, 1724 IPV6CTL_MAXFRAGS, CTL_EOL); 1725 sysctl_createv(clog, 0, NULL, NULL, 1726 CTLFLAG_PERMANENT, 1727 CTLTYPE_STRUCT, "stats", 1728 SYSCTL_DESCR("IPv6 statistics"), 1729 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1730 CTL_NET, PF_INET6, IPPROTO_IPV6, 1731 IPV6CTL_STATS, CTL_EOL); 1732 sysctl_createv(clog, 0, NULL, NULL, 1733 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1734 CTLTYPE_INT, "use_defaultzone", 1735 SYSCTL_DESCR("Whether to use the default scope zones"), 1736 NULL, 0, &ip6_use_defzone, 0, 1737 CTL_NET, PF_INET6, IPPROTO_IPV6, 1738 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1739 sysctl_createv(clog, 0, NULL, NULL, 1740 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1741 CTLTYPE_INT, "mcast_pmtu", 1742 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1743 NULL, 0, &ip6_mcast_pmtu, 0, 1744 CTL_NET, PF_INET6, IPPROTO_IPV6, 1745 CTL_CREATE, CTL_EOL); 1746 /* anonportalgo RFC6056 subtree */ 1747 const struct sysctlnode *portalgo_node; 1748 sysctl_createv(clog, 0, NULL, &portalgo_node, 1749 CTLFLAG_PERMANENT, 1750 CTLTYPE_NODE, "anonportalgo", 1751 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1752 NULL, 0, NULL, 0, 1753 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1754 sysctl_createv(clog, 0, &portalgo_node, NULL, 1755 CTLFLAG_PERMANENT, 1756 CTLTYPE_STRING, "available", 1757 SYSCTL_DESCR("available algorithms"), 1758 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1759 CTL_CREATE, CTL_EOL); 1760 sysctl_createv(clog, 0, &portalgo_node, NULL, 1761 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1762 CTLTYPE_STRING, "selected", 1763 SYSCTL_DESCR("selected algorithm"), 1764 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1765 CTL_CREATE, CTL_EOL); 1766 sysctl_createv(clog, 0, &portalgo_node, NULL, 1767 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1768 CTLTYPE_STRUCT, "reserve", 1769 SYSCTL_DESCR("bitmap of reserved ports"), 1770 sysctl_portalgo_reserve6, 0, NULL, 0, 1771 CTL_CREATE, CTL_EOL); 1772 sysctl_createv(clog, 0, NULL, NULL, 1773 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1774 CTLTYPE_INT, "neighborgcthresh", 1775 SYSCTL_DESCR("Maximum number of entries in neighbor" 1776 " cache"), 1777 NULL, 1, &ip6_neighborgcthresh, 0, 1778 CTL_NET, PF_INET6, IPPROTO_IPV6, 1779 CTL_CREATE, CTL_EOL); 1780 sysctl_createv(clog, 0, NULL, NULL, 1781 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1782 CTLTYPE_INT, "maxdynroutes", 1783 SYSCTL_DESCR("Maximum number of routes created via" 1784 " redirect"), 1785 NULL, 1, &ip6_maxdynroutes, 0, 1786 CTL_NET, PF_INET6, IPPROTO_IPV6, 1787 CTL_CREATE, CTL_EOL); 1788 } 1789 1790 void 1791 ip6_statinc(u_int stat) 1792 { 1793 1794 KASSERT(stat < IP6_NSTATS); 1795 IP6_STATINC(stat); 1796 } 1797
Indexes created Tue Sep 23 07:09:52 GMT 2025